Select all prime numbers from the list: 21, 29, 31, 39.
Note
29 and 31 have no divisors other than 1 and themselves so they are prime; 21 and 39 are divisible by 3, so they are composite.
Select all prime numbers from the list: 21, 29, 31, 39.
29 and 31 have no divisors other than 1 and themselves so they are prime; 21 and 39 are divisible by 3, so they are composite.